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Pulley system to lift container. How much force?

  1. Nov 5, 2012 #1
    1. I am stuck. Could anybody push me in the right direction?

    Best Regards Lasse
     

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    Last edited: Nov 5, 2012
  2. jcsd
  3. Nov 5, 2012 #2
    The minimum force needed to lift the weight will be the same as the force needed to hold the weight without falling.

    So this is a statics question, find the force needed to keep everything where it is. Draw a free body diagram for the entire thing -- you should find the force F applied to the rope, the mass has some weight and there is some force applied by a shaft to hold the pulleys in place. Can you write an equation that will allow you to ignore the force applied by the shaft?
     
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